The GLSL Hacker demo (menger_sponge.xml) is available in the host_api/GLSL_raymarching/ folder of the code sample pack (DEV version). The use of the latest DEV version of GLSL Hacker to play with demos is highly recommended!

Menger sponge demo under OS X 10.9 with a GeForce GT 650M

Menger sponge demo under Windows with A Radeon R7 (A10-7850K APU)

I don’t know what GLSL instructions are problematic with NVIDIA hardware under Windows, but the tuning of the Menger sponge with a GeForce GTX 660 was just awful. I had tons of NVIDIA OpenGL driver lost connection message boxes with countless reboots (drivers: R334.67)!

So I switched to my recent AMD A10-7850K based setup to finish and test the menger sponge demo. With the Radeon R7, there was absolutely no issue!